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Capitalized Interest Capitalized Interest (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Capitalized interest, beginning of year | $ 237.4 | $ 217.7 | $ 207.7
Interest incurred | 203.5 | 162.5 | 152.2
Charged to cost of sales | (154.5) | (142.8) | (142.2)
Capitalized interest, end of year | 286.4 | 237.4 | 217.7
Financial Services [Member] |  |  |
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Interest incurred | 45.9 | 18.9 | 17.0
Forestar Group [Member] |  |  |
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Interest incurred | 32.8 | $ 32.9 | $ 41.6
Rental |  |  |
Real Estate Inventory, Capitalized Interest Costs [Roll Forward] |  |  |
Interest incurred | $ 56.0 |  |

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- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 835 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483013/835-20-50-1 + Details
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- Definition Carrying amount as of the balance sheet date of interest costs that were capitalized to properties under development during the land development and construction period of a project, and which are included in inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483013/835-20-50-1 + Details
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- Definition Amount of interest cost charged to cost of sales that had been previously capitalized to inventory. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 835 -Publisher FASB -URI https://asc.fasb.org//1943274/2147483013/835-20-50-1 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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